diff --git a/apps/enm/services.py b/apps/enm/services.py
index 9958351f..0631d684 100644
--- a/apps/enm/services.py
+++ b/apps/enm/services.py
@@ -15,6 +15,7 @@ from server.settings import get_sysconfig
 from apps.enm.models import EnStat
 from django.db.models import Sum
 from typing import Dict, Any
+from decimal import Decimal
 
 myLogger = logging.getLogger("log")
 
@@ -176,7 +177,10 @@ class MpointCache:
         current_cache_val = self.data
         cache_key = self.cache_key
         last_data = current_cache_val["last_data"]
-        last_data["last_val"] = last_val*current_cache_val.get('coefficient', 1)
+        if last_val:
+            last_data["last_val"] = last_val*current_cache_val.get('coefficient', 1.0)
+        else:
+            last_data["last_val"] = last_val
         last_data["last_timex"] = last_timex
         last_mrs = None  # 设备状态信号
         mpoint_is_rep_ep_running_state = current_cache_val["is_rep_ep_running_state"]